SwingWorker is one of the most handiest utility classes provided in Swing. Most of the interviews on Swing have a question or two on this class. Let’s make sure you know all about it’s need and usage. Step by Step.
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Using SwingWorker - A Step by Step tutorial

This article gives step-by-step instructions to setup captcha in your JSP page using recaptcha. In total there are 3 steps

• Sign up at http://recaptcha.net and get the Public and Private Keys
• Download the reCaptcha4j library
• Write code in your jsp to implement it

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Captcha Implementation in JSP to prevent Spam in 5 minutes : step by step

Consider the following code..

 try{
	while(true){
		System.out.println("test");
	}
}
catch(SQLException e){
	System.out.println(e);
}

This wouldn’t even compile because SQLException is a checked exception and it isn’t being thrown from anywhere in the try block.
However “Heinz M. Kabutz” claims that this can actually
be thrown from the try block!! Can you think how?
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Asynchronous Exceptions, the third kind of Exceptions in Java